I came across a pair of '05 38.5's with only a few 32nds wear. I ordered in 3 new tires to complete my Jeep set. I was shocked to find that the new tires were shorter then the old tires. Upon contacting the mfg I was told that bias ply tires grow with age. Upon searching for info on this I found nothing but info of speed growth on drag cars. Any HELP???